Automatic transmission for vehicle
In an automatic transmission apparatus (10) for a vehicle provided with a shift lever (20) manually changing a position of an automatic transmission (50), a torque detector (30) for detecting a changing operation force of the shift lever, and an assist force applying means (40) for applying a backup force to the manual operating force of the shift lever so as to transmit to the automatic transmission via a transmitting means (52–54), thereby changing to a desired position, a lever base (26) of the shift lever (20) is mounted to an input shaft (31a) of the rotation axis (31) of the torque detector (30), and an output gear (43) of the assist force applying means (40) is mounted to an output shaft (31b) of the rotation axis (31) of the torque detector (30), and the rotation axis of the shift lever (20), the rotation axis (31) of the torque detector (30) and the rotation axis of the assist force applying means (40) are arranged in a line.
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This application is based upon and claims the benefit of priority from the prior Japanese Patent Applications No. P2002-371797, filed on Dec. 24, 2002: the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to an automatic transmission apparatus, for example mounted on a vehicle, which has a shift lever for changing a range positions of a range changing mechanism, such as P (Parking), R (Reverse), N (Neutral), D (Drive), 2 (Second) and L (Low), and reduces a passenger's strain for changing the positions of the range changing mechanism by applying an assist force to an operating force of the passenger.
2. Description of the Related Art
As shown in
However, since the conventional automatic transmission apparatus 1 for the vehicle is provided independently with the shift lever 3, the servo actuator 5 and the shift lever sensor 9, and therefore a transmitting means such as the Bowden cables 6a and 6b connecting the shift lever 3 and the servo actuator 5 are indispensability needed. Accordingly, there are problems that the number of the parts constituting the conventional transmission is increased, and the conventional an entire apparatus is large-scaled and is heavy.
Accordingly, the present invention is made to address the problems mentioned above, and an object of the present invention is to provide an automatic transmission apparatus for a vehicle in which a number of parts can be reduced, and an entire apparatus can be downsized and save weight.
SUMMARY OF THE INVENTIONIn order to achieve the object mentioned above, there is provided an automatic transmission apparatus for a vehicle comprising: a shift lever manually changing a position of an automatic transmission; a torque detector for detecting a changing operation force of the shift lever; and an assist force applying means for applying an assist force to the manual operating force of the shift lever so as to transmit to the automatic transmission via a transmitting means, thereby changing to a desired position, wherein a rotation axis of the shift lever, a rotation axis of the torque detector and a rotation axis of the assist force applying means are arranged in a line.
According to the present invention, since the rotation axis of the shift lever, the rotation axis of the torque detector and the rotation axis of the assist force applying means are arranged in a line. It is possible to make the structure compact and light-weighted, and it is also possible to obtain a good operation feeling having a direct feeling.
A description of an embodiment according to the present invention will be given below with reference to the accompanying drawings.
As shown in
As shown in
A boundary of the small-diameter portion 21a and the large-diameter portion 21b is slidably supported within a sleeve 14 fitted to a penetrating long hole 13 which is formed on upper surfaces of the pair of cases 11 and 12 and is extended in a longitudinal direction. Further, both sides of the lock pin 23 are configured to be freely engaged with stepped stopper portions 15a of notched holes 15 (see
Further, the lever base 26 fixed to the shift lever 20 is mounted to an input shaft 31a of a rotation shaft 31 of the torque detector 30. In detail, the lever base 26 is formed in a L-shaped and comprising a horizontal portion 261 fixed to the shift lever 20 and a vertical portion 262 integrally provided with the horizontal portion 261. The vertical portion 262 of the L-shaped lever base 26 is mounted between one end of the torque detector 30 in a width direction and the case 11. In other words, the lever base 26 is mounted in the direction of a torque detecting portion 33 of the torque detector 30. Accordingly, the lever main body 21 of the shift lever 20 is positioned approximately just above the torque detecting portion 33.
As shown in
As shown in
The torque detected by the torque detecting portion 33 of the torque detector 30 is increased according to an increasing amount of the load applied to the shift lever 20. The control amplifier 44 increases an applied voltage of the electric motor 41 corresponding to the detected load of the shift lever 20, thereby the torque of the electric motor 41 is increased. And the increased torque (the assist force) of the electric motor 44 is added to the manual operating force of the shift lever 20. Accordingly, since the control amplifier 44 generates a necessary torque to easily perform the manual shift change operating, even in the case that the shift lever 20 is made short, the force required for operating the shift lever 20 is not increased. In other words, the structure is made such that a part or all of the torque increased by making the shift lever 20 short can be compensated by the torque generated by the electric motor 41.
In this case, as shown in
As mentioned above, according to the automatic transmission apparatus 10 for the vehicle of the present embodiment, the shift lever 20, the torque detector 30 and the actuator 40 are integrally provided with the pair of cases 11 and 12, these elements being conventionally separated into a plurality of parts. In other words, since the rotation shaft of the shift lever 20 is performed both as the input shaft 31a of the rotation shaft 31 of the torque detector 30, the rotation shaft of the worm wheel 43 serving as the output gear of the actuator 40 is performed both as the input shaft 31b of the rotation shaft 31 of the torque detector 30, and the rotation shaft of the shift lever 20, the rotation shaft 31 of the torque detector 30 and the rotation shaft of the worm wheel 43 of the actuator 40 are performed both as one rotation shaft 31 so as to be arranged in a line, it is possible to obtain a good operation feeling having a direct feeling with no play or the like in the case of changing the shaft lever 20 to each of the range positions.
Further, since the lever base 26 of the shift lever 20 is fixed to the input shaft 31a of the rotation shaft 31 of the torque detector 30, and the worm wheel 43 of the actuator 40 is fixed to the output shaft 31b of the rotation shaft 31 of the torque detector 30, the rotation shaft of the shift lever 20 and the rotation shaft of the worm wheel 43 are not required. Accordingly, it is possible to reduce the number of the parts, and it is possible to achieve a weight saving and a cost reduction.
Further, since the L-shaped lever base 26 of the shift lever 20 is fixed to the input shaft 31a of the rotation shaft 31 of the torque detector 30 so as to be offset arranged with respect to the torque detecting portion 33 of the torque detector 30, and the lever main body 21 of the shift lever 20 is arranged just above the torque detecting portion 33, it is possible to reduce an entire width of the automatic transmission apparatus 10 for the vehicle, and it is possible to achieve a downsizing.
Further, since the rotation shaft 31 of the torque detector 30 can be comprised of the metal shaft, it is possible to prevent the play from being increased by a durability deterioration, the characteristic is not changed, and it is possible to always keep a good characteristic.
Claims
1. An automatic transmission apparatus for a vehicle comprising:
- a shift lever changing a range position of an automatic transmission;
- a torque detector for detecting a changing operation force applied to the shift lever; and
- an assist force applying means which adds an assist force to the manual operating force applied to the shift lever so as to transmit the manual operating force with the assist force to the automatic transmission via a transmitting means and changes the range position of the automatic transmission,
- wherein a rotation axis of the shift lever, a rotation axis of the torque detector and a rotation axis of the assist force applying means are arranged in a line.
2. An automatic transmission apparatus for a vehicle according to claim 1, wherein a lever base of the shift lever is mounted to a side of an input shaft of the rotation axis of the torque detector, and an output gear of the assist force applying means is mounted to a side of an output shaft of the rotation axis of the torque detector.
3. An automatic transmission apparatus for a vehicle according to claim 2, wherein the lever base of the shift lever is mounted so as to be offset arranged with respect to a torque detecting portion of the torque detector, and a lever main body of the shift lever is arranged approximately just above the torque detecting portion.
4. An automatic transmission apparatus for a vehicle according to claim 1, wherein the assist force applying means further comprises a motor to generates the assist force.
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Type: Grant
Filed: Dec 18, 2003
Date of Patent: Feb 13, 2007
Patent Publication Number: 20040123693
Assignee: Calsonic Kansei Corporation (Tokyo)
Inventors: Takeshi Ogasawara (Sano), Takeshi Satoh (Sano), Daisuke Kondo (Tochigi), Takanori Mori (Sano)
Primary Examiner: David M Fenstermacher
Attorney: Foley & Lardner LLP
Application Number: 10/737,926
International Classification: B60K 20/00 (20060101);